San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
Why Don't Repellents Work Well To Get A Rat Out Of The Attic?
The urgent need for people to get rid of rats in their attic has made many consider humane removal methods apart from trapping and killing, one of which is the use of repellents. But here is the question! Do repellents work in getting rats out of attics?
The main idea of a repellent is to make the environment unsuitable for rats. This is achieved by using several techniques such as, scents and sound emissions. Although there is a wide range of repellents to choose from, the fact is that the use of repellents might not give you the kind of result that you desire in the long run. It might help keep them away for a while, but when the effects of the repellents subside, they will come back.
Let's take a look at some supposed effective rat repellents and how they were designed to work. With this, you will have a clear picture of the result you might get when you choose to use repellents to get rid of the rats in your attic.
Scent repellents are one of the most common repellents that are readily available in stores. This repellent is designed to use intense scent to either irritate or nauseate the rats. When used the first time, this might help repel the rats as intended. But with time, these rats will get used to this scent and will tend to stay until they get accustomed to it.
Another commonly used rat repellent is mechanical repellents. Apart from being ineffective, they are also very expensive. These repellents are designed to use sound and light waves to repel rats in the attic. This will also not give the desired results simply because rats are intelligent animals and will figure out that the mechanism can't cause any harm to them.
Having realized this, the best thing you can do to repel rats in your attic is by making it less appealing to them. This can be done by cleaning out the trash and making sure there are no hiding places for the rats.
